Bulb won customers by making a confusing, low-trust industry feel simple, fair and human. It combined a clear single tariff, plain language, a generous referral scheme and consistent green positioning with heavy use of comparison sites and reviews. The result was one of the fastest customer growth stories in UK energy retail, built on trust rather than advertising spend.
Bulb was a British energy supplier founded in 2015 by Hayden Wood and Amit Gudka, offering 100% renewable electricity and carbon neutral gas at competitive prices. Within a few years it grew to serve over 1.7 million households, becoming one of the largest independent suppliers in the UK before it entered special administration in late 2021 amid the global energy price crisis, with its customer accounts later transferred to Octopus Energy. Regardless of how the story ended, Bulb’s early and mid growth phase offers a genuinely useful case study for entrepreneurs. It shows how positioning, pricing clarity, referral marketing and tone of voice can be used to break into a market dominated by large, distrusted incumbents.
Positioning against a distrusted industry
Bulb entered a market where the big six energy suppliers were widely associated with confusing bills, poor customer service and a sense that switching was not worth the hassle. Rather than competing on being bigger or more established, Bulb positioned itself as the opposite of the incumbents: smaller, greener and easier to deal with. Its early marketing consistently drew a contrast between complicated legacy suppliers and a simple, renewable alternative that did not cost more to join.
How to apply this to your business: Identify the specific frustration customers have with existing providers in your category, then build your positioning directly around solving that frustration rather than simply claiming to be better. Say plainly what you do differently and why it matters to the customer, not just to you.
A single, simple tariff instead of confusing options
Traditional energy suppliers offered multiple tariffs with varying rates, exit fees and terms, which made comparison difficult for most households. Bulb instead offered one main variable tariff for most of its life, based on 100% renewable electricity, with pricing that tracked wholesale costs. This simplicity became a marketing asset in itself, because it removed the need for customers to decode which deal suited them.
How to apply this to your business: Where possible, reduce your pricing or product options down to one or two clear choices rather than a long list that forces customers to compare and decide. A simple offer is easier to explain, easier to sell and easier for customers to recommend to others.
The referral scheme as a growth engine
One of Bulb’s most effective tactics was its member referral programme, which rewarded existing customers with a cash credit for every new customer they brought in, with the new customer also receiving a credit. Because energy switching is a low-frequency, considered decision, word of mouth from a trusted friend or family member carried far more weight than an advert. This referral loop became a major driver of Bulb’s customer acquisition in its fastest growth years.
How to apply this to your business: Build a referral incentive that rewards both the existing customer and the new one, so the recommendation feels like a shared benefit rather than a one sided ask. Make the reward simple to understand and quick to receive, since delays or complicated terms reduce how often people bother to share.
Calling customers members
Bulb consistently referred to its customers as members rather than customers or accounts. This small language choice ran through its website, emails and customer service communications, reinforcing the idea that people were joining something rather than simply buying a commodity. It supported a broader brand tone that felt more like a community than a utility company.
How to apply this to your business: Look at the language you use to describe the people who buy from you, and consider whether it reflects the relationship you actually want to build. Small, consistent wording choices across your website and emails can shift how customers perceive their relationship with your brand over time.
Plain language instead of industry jargon
Energy bills and tariffs are traditionally full of technical terms such as standing charges, unit rates and estimated versus actual readings. Bulb’s marketing and customer communications made a point of explaining these concepts in everyday language, using blog content and onboarding emails to help new members understand exactly what they were paying for and why. This reduced confusion and, in turn, reduced the number of support queries and complaints.
How to apply this to your business: Rewrite your key customer facing documents, whether contracts, invoices or onboarding emails, as if you were explaining them to a friend with no background knowledge. Clear communication reduces support costs and builds trust at the same time, which is a rare combination worth prioritising.
Content marketing that educated rather than sold
Bulb published blog content explaining topics such as how switching energy suppliers works, what renewable energy actually means, and how households could reduce their bills. This content was designed to be genuinely useful to someone researching energy switching, rather than being a thinly disguised sales pitch. It helped Bulb rank in search results for the practical questions people were already asking.
How to apply this to your business: Write content that answers the real, specific questions your prospective customers are searching for before they are ready to buy, rather than only publishing content about your own product. This builds trust earlier in the decision process and gives you a reason to appear in search results beyond paid advertising.
Winning through comparison sites and reviews
Because most UK energy switching happens through comparison websites such as uSwitch and MoneySuperMarket, Bulb invested heavily in being competitively priced and well reviewed on these platforms. A strong Trustpilot rating, combined with a price that regularly appeared near the top of comparison results, meant Bulb was frequently the switching recommendation for people actively looking to change supplier.
How to apply this to your business: If your customers typically compare providers before buying, treat the platforms where that comparison happens as a core marketing channel, not an afterthought. Actively encourage satisfied customers to leave reviews, since a strong, genuine review profile can do more to convert a comparison shopper than most advertising.
Green positioning tied to a genuine product difference
Bulb’s environmental positioning was not just a marketing message layered on top of a standard product. Its electricity was sourced from 100% renewable generation and it offset the carbon associated with the gas it supplied, meaning the sustainability claim was backed by an actual difference in the product. This gave its green marketing more credibility than companies simply claiming to be eco-friendly without a underlying operational change.
How to apply this to your business: Only make sustainability or ethical claims that are backed by a real change in how you source, produce or deliver your product. Customers are increasingly likely to check these claims, and a mismatch between marketing and reality can damage trust far more than never making the claim at all.
Digital-first, low overhead model reflected in messaging
Bulb operated primarily online, with sign up, billing and customer service largely handled through digital channels rather than physical branches or extensive call centre infrastructure. This lower cost base supported its pricing promise and was reflected in marketing that emphasised simplicity and efficiency, such as quick online sign up and clear digital billing, rather than traditional utility company processes.
How to apply this to your business: If your operating model genuinely allows you to offer lower costs or faster service, make that operational advantage part of your customer facing story rather than keeping it purely internal. Customers respond well to understanding why a company can offer a better deal, not just being told that it does.
Transparent communication during price changes
Because Bulb’s tariff moved with wholesale energy costs, it needed to communicate price changes to members regularly. Rather than burying these changes in small print, Bulb used direct emails and blog posts to explain why prices were moving and what it meant for individual bills. This approach aimed to maintain trust even when the news itself, a price rise, was not welcome.
How to apply this to your business: When you need to raise prices or change terms, explain the reason clearly and give customers advance notice rather than making the change quietly. Customers are far more forgiving of a price increase they understand than one that feels hidden or unexplained.
Founder visibility and public accountability
Bulb’s co-founders were often visible in media coverage and public commentary about the energy market, discussing the company’s growth, its renewable energy model and, later, the pressures facing the wider industry during the wholesale price crisis. This visibility gave the brand a human face and allowed it to explain difficult moments directly, rather than only communicating through generic corporate statements.
How to apply this to your business: Consider putting a real person, whether a founder or a senior team member, at the front of your public communications, especially during difficult periods. A named, visible voice tends to build more trust than anonymous corporate messaging, particularly for smaller and growing businesses.
Retention through simplicity rather than lock-in
Unlike some competitors that used long fixed contracts and exit fees to retain customers, Bulb largely relied on its variable tariff with no exit fees for much of its history, betting that a fair price and good service would retain members better than contractual penalties. This reduced the friction of joining and reflected a broader brand promise that customers were free to leave if they were not satisfied.
How to apply this to your business: Where it is commercially viable, reduce the contractual barriers that trap customers into staying, and instead focus your energy on genuinely earning their loyalty. A low-friction exit policy, combined with real efforts to keep customers happy, can be a stronger long-term retention strategy than penalty-based contracts.
Frequently asked questions
What made Bulb’s marketing different from other energy suppliers?
Bulb combined a simple product structure, plain language, a strong referral programme and genuine renewable energy sourcing into one consistent brand experience. Rather than relying heavily on traditional advertising, it grew mainly through word of mouth, comparison site rankings and customer reviews, which felt more trustworthy in a sector where consumers were generally sceptical of marketing claims.
Is Bulb still operating today?
Bulb entered special administration in November 2021 after a sharp rise in global wholesale gas prices made its pricing model unsustainable, a problem that affected many energy suppliers across the UK during that period. In 2022, Bulb’s customer accounts were transferred to Octopus Energy, and the Bulb brand ceased to operate as an independent supplier.
Did Bulb’s marketing strategy fail?
Bulb’s collapse was driven primarily by a wholesale energy price crisis affecting the entire market, not by a failure of its marketing or brand strategy. In fact, the marketing approach was largely responsible for its rapid growth to over a million and a half customers, which shows that strong marketing can build a large, loyal customer base even if the underlying business later faces external financial pressures it cannot control.
Can small businesses realistically copy a referral scheme like Bulb’s?
Yes, in principle, though the reward structure needs to suit your margins and typical customer value. The key lesson from Bulb is not the specific cash amount but the idea of rewarding both the existing customer and the new one, and making the process simple enough that recommending your business feels effortless.
What is the single biggest lesson from Bulb’s marketing for a small business owner?
Simplicity and honesty were at the core of everything Bulb did well, from its single tariff to its plain language communications and transparent price change updates. For a small business, consistently removing confusion from the customer experience and being straightforward about pricing and changes tends to build more long-term trust than clever advertising campaigns alone.
More marketing case studies
- Tinder Marketing Strategy: How They Built a Brand That Wins
- Twitch Marketing Strategy: How They Built a Brand That Wins
- Netflix Marketing Strategy: How They Built a Brand That Wins
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